My copam 2500 has been turning off and on. As soon as I power it up it automatically (at about 1-2 second intervals) continually goes off and then on, and the carriage tries to move further to the right as it comes on and then it shuts off to start up and do it again. We have replaced the carriage and it didn't change anything. Do we need a new motherboard? I thought it was a communication error with the computer, but it does it regardless of whether or not it's hooked up to the computer. Any help would be appreciated!!!!